[CLD-149]: fix: Migrate legacy addressbook from Chainlink

[graham-chainlink]

Start with something simple and least likely to change

This is a lift and shift, i am avoiding any improvements or refactoring that can be done. Beside i think this package will be deleted in future once Datastore is fully rolled out

Files migrated from chainlink repo

• address_book.go
• address_book_test.go
• address_book_labels.go -> renamed to labels
• address_book_labels_test.go

However I did not migrate the snippet below found here, i think this is quite specific to ccip

var (
	Version0_5_0 = *semver.MustParse("0.5.0")
	Version1_0_0 = *semver.MustParse("1.0.0")
	Version1_1_0 = *semver.MustParse("1.1.0")
	Version1_2_0 = *semver.MustParse("1.2.0")
	Version1_5_0 = *semver.MustParse("1.5.0")
	Version1_5_1 = *semver.MustParse("1.5.1")
	Version1_6_0 = *semver.MustParse("1.6.0")
)

JIRA: https://smartcontract-it.atlassian.net/browse/CLD-149

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